Damper.



W. D. LUCE.

DAMPER.

Arrmomron FILED un. 30,1908.

Patented 0G12. 27, 1908.

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'W. D. LUCE.

DAMPEB.

APPLICATION FILED MAB. so, 190s.4

l Patented 0013.27, 1908.

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WILLIAM D. LUCE, OF HAVERHILL, MASSACHUSETTS.

DAMPER.

Specification of Letters Patent.

Patented Oct. 27, 1908.

Application led. March 30, 1908. Serial No. 424,005.

To all 'whom it may concern.'

Be it known that I, WILLIAM D. LUCE, of Haverhill, county of Essex, State of Massachusetts, have invented an Improvement in Dampers, of which the following is a specification.

This invention .particularly relates to a form of damper which is especially adapted to be controlled by an automatic regulator.

In this class of devices the air check is usually arranged between the damper and the chimney, rather than between. the damper and the furnace, as there is less danger of gas escaping through the air check when the damper is closed and the air check is open than in the latter arrangement.

When an automatic regulator is used in connection with an arrangement in which the air check is located between the damper and chimney, and in which one is fully closed when the other is vfully o ened, in order that the iire may be checke promptly, a much larger volume of air must be admitted through the air check during the closing movement than is necessary to hold the fire in check thereafter, so that, after thevfire is checked, the warm air from the room or cellar in which the furnace is located is drawn therefrom in much larger quantities than is necessary, thus cooling the room or cellar to an unnecessary extent.

It is necessary to place the damper and air check sometimes in a vertical and sometimes in a horizontal pipe, according to conditions, and, where these devices have been operated together with an automatic regu lator, differently constructed devices have been generally used in these positions.

The object of my invention is to provide a combined damper and air check in one structure, which, when pro erly adjusted, will prevent air from being raWn from the place in which the furnace is located to a greater extent than is necessary to check the fire, which may be used in either a horizontal or vertical position, and which is compact and simple in construction.

I accomplish these objects by the means shown in the accompanying drawing, in which,

Figures l and 2 are side elevations of my device arranged for use in a horizontal pipe, and showing the moving parts in open and closed positions respectively. Fig. 3 is a view partly in plan and partly in horizontal section on the line 3 3 of Fig. l. Fig. 4 is an end view of the device. Fig. 5 is a side elevation showing the parts in position for use in a vertical pipe, and,A Fig. 6 is an elevation showing the application of my invention.

In the drawing al indicates a short length of pipe adapted to be inserted at any convenient point in the smoke pipe p of a furnace g. Two circular dampersb and c are respectively mounted on and secured to diametrical pivots d, d and e, e, adjacent the opposite ends of the pipe section a, the pivots d and e having crank arms d2 and e2 respectively connected thereto, and said arms being connected by a link f, so that said dampers will operate in unison. An arm g is mounted on the outer end of pivot e, and is secured thereto by means of a set screw g', so that itmay be held thereon at different positions with relation to the dampers, and said arm g is adapted to be connected at different points throughout its length to the operating rod h of an automatic regulator, not shown, so that, when theoperating rod h is moved up and down, the dampers will be opened or closed in unison, their closed position being shown in Fig. l and their open position being shown in Fig. 2. If the operating rod is moved vertically, then the arm g is adjusted on pivot e so that it is horizontal when the dampers are half closed, the different ad justment for a horizontal and for a vertical position of casing a being shown in Figs. 1 and 5, respectively.

An air inlet opening i is provided in the side of the casing a midway between the dampers and a rectangular shaped door j is pivoted in the middle thereof on a pivot 7c, which is arranged at right angles to the pivots d and e, said door being arranged in position to close said opening i, so that, as it moves to its open position it swings inward at one end and outward at the other end. A link m is connected to the inwardly swinging portion of the door j, at one end, and at its other end to the link f, a loose connection bein provided at each point, so that, practica ly, a universal connection is provided. The arrangement is such that, when the dampers b and c are in the open position shown in Fig. 2, the air check door j will be in its closed position. When, however, the link fis moved to the right, to open the dampers, the link m causes the portion of the door j to lflO which it is connected to swing inwardly, so that parts assume the position of Figs. l, 3 and 4 when the door is fully open.

Each damper b and c is to be made to it loosely in the pipe and portions at the edges thereof are usually cut away as shown, so that they will only close the pi e partially when in their closed position, sufficient space being provided to permit the gases from the furnace to escape. Preferably, however, each damper is provided with openings b, c adapted to be partially or wholly closed, ac-

- cording to conditions, by means of valve plates n, o, centrally pivoted at n, o on the dampers.

In practice, as the regulator moves the operating rod h to close the dampers and check the fire, the air check will be opened, permitting air to enter the smoke pipe between the dampers, so that the draft is checked, and at the same time the smoke pipe is obstructed. If the closing movement is continued until the dampers are in parallel positions, at which time the fire is usually checked to the desired extent, the door y' will be completely opened, and, if it were not for the damper c between it and the chimney, much more air would pass through the opening t' than would be necessary to check the iire, thus drawing an unnecessary amount of warm air from the cellar, but said damper will prevent the unnecessary escape of air in this manner in a large measure, the adjustment of plates n and o being such that the gases from the furnace may escape through the dampers to the chimney and suflicient air be taken in through opening t to cause an in-draft and to check the draft through the furnace. The damper I) next the furnace prevents the escape of the products of combustion from the furnace so rapidl that some of them would escape through t 1e air-check into the cellar. To prevent the possibility of such escape the apertures through the damper next the chimney may be opened somewhat wider than those in the one next the furnace.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. In combination with a furnace, a smoke pipe having an air-check opening through the side thereof and a door for closing sald opening, a pair of dampers adapted and arranged partially to close the passageway at each side of said opening when in closed position, the damper next the furnace acting to restrict the discharge of gases from the furnace and the other damper acting to restrict the discharge of airthrough said opening into the pipe beyond the dampers, and means for simultaneously holding said dampers in closed position and said door in open position, substantially as described.

2. A device of the character described comprising a casing having a passageway therethrough, and a side opening, a pivot rod rotatably mounted. in said casing at each side of said opening and having dampers con nected thereto and movable thereon to obstruct said passageway, a door for closing said side-opening pivoted to swing transversely of said dampers, a connectin g link for said dampers movable longitudinally to operate them simultaneously, and a link pivoted at one end to said connecting link and at the other to said door and disposed to move said door towards its open position as the dampers are movedtowards their closed position, substantially as described.

3. In combination with a furnace, a damper located in the smoke pipe thereof and adapted partially to close the same when in its closed position, said smoke pipe having an air check opening leading thereinto and located entirely between the closed position of said damper and the furnace, and a door for closing said opening, connections between said door and damper disposed to cause one to be opened when the other is closed, and means for obstructing the passageway between the air check and the furnace, substantially as described.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

I/VILLIAM D. LUCE.

Witnesses:

L. H. HARRIMAN, H. B. DAVIS. 

